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Donner, Stefanie; Lin, Chin-Jen; Hadziioannou, Celine; Gebauer, Andre; Vernon, Frank; Agnew, Duncan Carr; Igel, Heiner; Schreiber, Ulrich; Wassermann, Joachim (2017): Comparing Direct Observation of Strain, Rotation, and Displacement with Array Estimates at Pinon Flat Observatory, California. In: Seismological Research Letters, Vol. 88, No. 4: pp. 1107-1116
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The unique instrument setting at the Pinon Flat Observatory in California is used to simultaneously measure 10 out of the 12 components, completely describing the seismic-wave field. We compare the direct measurements of rotation and strain for the 13 September 2015 M-w 6.7 Gulf of California earthquake with array-derived observations using this configuration for the first time. In general, we find a very good fit between the observations of the two measurements with cross-correlation coefficients up to 0.99. These promising results indicate that the direct and array-derived measurements of rotation and strain are consistent. For the array-based measurement, we derived a relation to estimate the frequency range within which the array-derived observations provide reliable results. This relation depends on the phase velocity of the study area and the calibration error, as well as on the size of the array.